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<div id='article-page'><div id='article-content' data-media-url='//news-app-staging.s3.amazonaws.com' data-base-url='//news-app-staging.herokuapp.com' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/cow.wav' data-capture-url='//staging.analytics.lingraphica.com/events/capture_news' data-article-title='Scientists Get First-Ever Measure of Blue Whale Heart Rate' data-article-id='4342'><script src='//news-app-staging.herokuapp.com/javascripts/getscripts.js'></script><link rel='stylesheet' href='//news-app-staging.herokuapp.com/stylesheets/article.css' type='text/css' /><div class='article'><p><span data-start-time='0' data-end-time='9146'>For the first time ever, scientists have recorded the heart rate of the world’s largest creature:</span> <span data-start-time='9146' data-end-time='11375'>the blue whale.</span> <span data-start-time='11375' data-end-time='20583'>To get this reading, they attached an electrocardiogram device to the body of a whale.</span> <span data-start-time='20583' data-end-time='35354'>They found that the mammal’s heart rate can slow to just two beats a minute as the animal searches for food below the surface of the ocean.</span> <span data-start-time='35354' data-end-time='46479'>The highest heart rate they recorded was 37 beats a minute after the whale returned to the surface for air.</span> <span data-start-time='46479' data-end-time='55771'>The team’s study appears online in the publication Proceedings of the National Academy of Sciences.</span> <span data-start-time='55771' data-end-time='61188'>The blue whale is the largest animal that has ever lived.</span> <span data-start-time='61188' data-end-time='71396'>It can grow to 30 meters long and weigh as much as 181,000 kilograms.</span> <span data-start-time='71396' data-end-time='77813'>The animal’s heart alone weighs more than a fully grown cow.</span> </p></div><div class='control-buttons-sticky' style='display:none;'><div class='control-buttons'><button title='Back' class='back' disabled='disabled'></button><button title='Play' class='play' disabled='disabled'></button><button title='Pause' class='pause' style='display:none;'></button><button title='Forward' class='forward' disabled='disabled'></button><button class='finished-reading' style='display:none;'>Done</button></div></div></div><div id='article-media'><div id='media-image'><img src='https://news-app-production.s3.amazonaws.com/articles/3798/cow.jpg'/></div></div><div id='question-content' style='display:none;'><div class='vocabulary_question question-container' data-question-id=14103 data-hint-location='46479' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/what_does_proceeding_mean.wav'>What does proceeding mean?</div><div class='choices' data-correct-choice='course of action'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/method_of_measurement.wav'><span>method of measurement</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/course_of_action.wav'><span>course of action</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/length_and_weight.wav'><span>length and weight</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/below_the_surface.wav'><span>below the surface</span></div></div></div><div class='multiple_choice_question question-container' data-question-id=14104 data-hint-location='55771' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/what_is_the_worlds_largest_animal.wav'>What is the world's largest animal?</div><div class='choices' data-correct-choice='the blue whale'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/a_fully_grown_cow.wav'><span>a fully grown cow</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_blue_whale.wav'><span>the blue whale</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/a_mammal_heart.wav'><span>a mammal heart</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_last_dinosaur.wav'><span>the last dinosaur</span></div></div></div><div class='sentence_completion_question question-container' data-question-id=14105 data-hint-location='20583' style='display:none;'><div class='question' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/the_heart_rate_can_slow_to__blank__beats_per_minute.wav'>The heart rate can slow to <span class='blank'>2</span> beats per minute.</div><div class='choices' data-correct-choice='2'><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/2.wav'><span>2</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/37.wav'><span>37</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/zero.wav'><span>zero</span></div><div class='choice' data-sound-name='https://news-app-production.s3.amazonaws.com/articles/3798/fewer.wav'><span>fewer</span></div></div></div><div class='question-buttons'><button class='skip-button'></button><button class='hint-button'></button><button class='speak-button'></button></div></div></div>
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